Algebra 2

[No_OnE]

I can't get a hold of any of my friends and I'm stumped on two problems... If someone could just help... I'll just tell the two problems and what I'm supposed to do...

 

 

 

1. - 9(2x+3) > 10

 

 

 

2. - (2x+3)/5 > 0.03

 

 

 

I just need to solve for "x". I understand them but when I get an answer, it doesn't workout in the problem... Btw, the answer should be like x > answer or something like that...

[KCHughes]

1. X< -2 1/18. Remember, when dividing or multiplying a negative number to the other side of the equation, the greater/lesser sign changes directions.

 

 

 

2. X = -1.575. Same as above.

[heart_of_ink]

For the first one, I got x > -0.94444... I haven't gone back to school yet, math isn't my strong point, and I'm very rusty, so don't go with my advice as a definite answer.

[No_OnE]

1. X< -2 1/18. Remember, when dividing or multiplying a negative number to the other side of the equation, the greater/lesser sign changes directions.

 

 

 

2. X = -1.575. Same as above.

 

Your a life saver. I'm usually very good with math, especially algebra but I just couldn't seem to get the correct answer for those problems... I know about the whole changing the direction of the sign but I still couldn't get it... Anyway, thanks again...

[Evadek]

1. X< -2 1/18. Remember, when dividing or multiplying a negative number to the other side of the equation, the greater/lesser sign changes directions.

 

 

 

2. X = -1.575. Same as above.

 

 

 

aha, I got here

 

 

 

1. 9(2x+3) > 10

 

 

 

18x+27 > 10

 

 

 

18x +27 (-27) > 10 (-27)

 

 

 

18x > -17

 

 

 

x > -17/18

 

 

 

what went wrong?

[No_OnE]

That's what I got the first time... Someone explain...

[cyco]

1. X< -2 1/18. Remember, when dividing or multiplying a negative number to the other side of the equation, the greater/lesser sign changes directions.

 

 

 

2. X = -1.575. Same as above.

 

 

 

aha, I got here

 

 

 

1. 9(2x+3) > 10

 

 

 

18x+27 > 10

 

 

 

18x +27 (-27) > 10 (-27)

 

 

 

18x > -17

 

 

 

x > -17/18

 

 

 

what went wrong?

 

 

 

That seems right. Oh fix the -9 Remember to use the distubutive property with the 9(x2+3).

 

So it would be 9*2x + 9*3

[Greatsilverwyrm]

1. X< -2 1/18. Remember, when dividing or multiplying a negative number to the other side of the equation, the greater/lesser sign changes directions.

 

 

 

2. X = -1.575. Same as above.

 

 

 

aha, I got here

 

 

 

1. 9(2x+3) > 10

 

 

 

18x+27 > 10

 

 

 

18x +27 (-27) > 10 (-27)

 

 

 

18x > -17

 

 

 

x > -17/18

 

 

 

what went wrong?

 

 

 

You missed the negative sign on the 9, may be more, but I'm too tired to mess with it now.. even though it is ridiculously easy.

 

 

 

Stupid Calc.

[No_OnE]

It seems right but if you look closely and put x back into the original problem, it doesn't work out...

[Evadek]

1. X< -2 1/18. Remember, when dividing or multiplying a negative number to the other side of the equation, the greater/lesser sign changes directions.

 

 

 

2. X = -1.575. Same as above.

 

 

 

aha, I got here

 

 

 

1. 9(2x+3) > 10

 

 

 

18x+27 > 10

 

 

 

18x +27 (-27) > 10 (-27)

 

 

 

18x > -17

 

 

 

x > -17/18

 

 

 

what went wrong?

 

 

 

That seems right. Oh fix the -9 Remember to use the distubutive property with the 9(x2+3).

 

So it would be 9*2x + 9*3

 

 

 

That's what I did

 

 

 

You missed the negative sign on the 9, may be more, but I'm too tired to mess with it now.. even though it is ridiculously easy.

 

 

 

Stupid Calc.

 

 

 

Didn't notice that minus, thought it was the - "bla bla bla" kinda of hyphon.

 

 

 

So...

 

 

 

- 9(2x+3) > 10

 

 

 

-18x + -27 > 10

 

 

 

-18x > 37

 

 

 

 

 

x > 37/-18

 

 

 

That it?

 

 

 

The Windows Calculator is useless, i can't seem to do negative numbers on it

[Greatsilverwyrm]

You forgot to switch the greater-than when you divided by -18

[No_OnE]

Agh... Sorry... Now I screwed up everyone's answers... It wasn't a negative sign... Hehe... It was just a hyphen... I guess it wasn't the best place to put a hyphen...

 

 

 

Edit: On the first one, I reworked it and got it. On the second one, I have a friend helping me. No need to work these anymore unless you need to.

 

 

 

Btw, -17/18 was the answer to the first one so I was originally right... Sorry for the "-" sign mix up...

[KCHughes]

 

Didn't notice that minus, thought it was the - "bla bla bla" kinda of hyphon.

 

 

 

So...

 

 

 

- 9(2x+3) > 10

 

 

 

-18x + -27 > 10

 

 

 

-18x > 37

 

 

 

 

 

x > 37/-18

 

 

 

That it?

 

 

 

The Windows Calculator is useless, i can't seem to do negative numbers on it

 

 

 

That's right, but you didn't even have to distribute the -9 into the equation. You could have divided it into the 10 and gotten rid of it entirely. That's what I did, but your answer is still right. :D

[MNH]

I solved both equations actually, See if they are right or not, i don't really care because i took that before 2 years!

 

 

 

1. -9(2x+3)>10

 

-18x-27>10

 

-18x= 27 >10

 

x= 27/-18 = -1.5 >10

 

-1.5>10

 

 

 

2. - (2x+3)/5 >/= 0.03

 

-2x-3/5 >/= 0.03

 

-2x/5-3/5 >/= 0.03

 

-0.4x-0.6 >/= 0.03

 

-0.4x = 0.6

 

x = 0.6/-0.4 = -1.5

 

-1.5 >/= 0.03

 

 

 

I hope you would understand it :lol: !